Adjustable Locking Cutting Pliers for Rusted Nut Removal
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Solution Overview
Problem
Existing handheld cutting pliers are inadequate for easily removing rusted nuts from bolts, as they often require excessive force or manual effort, and lack effective mechanisms for adjusting cutting force and position.
Innovation Solution
A handheld, selectively lockable cutting pliers design featuring a fixed and movable assembly with a link member and adjustment mechanism, allowing for adjustable force application and 360-degree rotation of the cutting member for precise cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional pliers are used to grip and cut rusted nuts, then the tool structure remains simple, but the cutting force is insufficient and the tool cannot effectively remove stuck nuts
Solution Approach 1:
The patent implements a dynamic locking mechanism where a locking bar can be positioned at multiple locations along the handles to selectively lock the jaws at different opening distances. This allows the tool to adapt its structure dynamically based on the specific cutting task, providing both simple and complex configurations as needed.
Solution Approach 2:
The cutting tool is divided into distinct functional segments: a fixed jaw assembly, a movable jaw assembly, a locking mechanism with a locking bar, and a cutting member. This segmentation allows each component to be optimized independently while working together to provide the required cutting force.
2Force
If excessive force is applied to cut rusted nuts with traditional pliers, then the cutting force is sufficient, but the user experiences high manual effort and fatigue
Solution Approach 1:
The locking bar acts as an intermediary mechanism that stores and releases mechanical energy. When the user closes the handles, the locking bar engages at specific positions to lock the jaws, maintaining cutting force without requiring continuous user effort. This mediator allows the tool to hold force independently of ongoing user input.
Solution Approach 2:
The locking mechanism is designed to automatically engage and lock the jaws at predetermined positions during the closing motion. This preliminary locking action prepares the tool to maintain force without requiring the user to continuously apply pressure, reducing manual effort during the actual cutting operation.
3Manufacturing precision
If the cutting member is fixed in position, then the tool structure is simple, but the cutting precision and adaptability to different nut positions are limited
Solution Approach 1:
The cutting member is designed to be rotatable relative to the movable jaw assembly, allowing it to be dynamically repositioned to different angles and orientations. This dynamic adjustment capability enables precise cutting at various nut positions while maintaining a relatively simple overall tool structure.
4Adaptability or versatility
If the jaws are locked in fixed positions, then the locking mechanism is simple, but the adaptability to different nut sizes and positions is reduced
Solution Approach 1:
The locking mechanism is segmented into multiple discrete locking positions along the handles, with the locking bar capable of engaging at different locations. This segmentation provides adaptability to various nut sizes and positions while keeping each individual locking position simple and reliable.
Data Source
AI summary
A hand tool including a first assembly including a first handle and a first jaw, a second assembly including a second handle pivotally connected to the first handle and a second jaw pivotally connected to the second handle, a link member, and a link adjustment member movably connected to the first handle. The link adjustment member is configured for engaging with and axially moving the first end of the link member for adjusting a force applied by the first jaw and the second jaw onto the element in the closed position. The hand tool further includes a cutting assembly including a cutting member connected to the second jaw. The cutting member is configured for cutting the element.